Building an iPhone and Android app: a plain-language guide

Almost every founder with a big idea eventually asks: "Should this be an app?" Sometimes the answer is yes. Before you commit, it helps to understand how iPhone and Android apps are built, what launching in the stores involves, and what it costs to keep an app running.

Do you need an app at all?

A mobile app is worth it when people will use your product often and on the go — booking, tracking, messaging, ordering, checking in. Apps can send push notifications, work offline, and use the camera, GPS and other phone features more deeply than a website.

If people will visit only occasionally, or you haven't tested the idea yet, a fast mobile-friendly website or web app is often the better first step. You can always add apps later on the same back end.

iPhone, Android — or both?

In Canada, both iPhone and Android have large audiences, so most businesses want both. Your customers matter more than national averages, though: look at your website analytics to see which devices your visitors actually use.

Native vs. cross-platform

• Native apps are built separately for each platform — Swift for iPhone, Kotlin for Android. They offer the best performance and the deepest access to device features, but you're building and maintaining two apps.
• Cross-platform apps use a framework such as React Native or Flutter so one codebase runs on both platforms. For most business apps they look and feel native, and they're usually faster and less expensive to build and update.

What goes into an app

The part people see is only half the work. Most apps also need:

• A back end — the server and database that store accounts, content, bookings or orders.
• An admin dashboard so your team can manage users and content without a developer.
• Integrations — payments, maps, email, calendars, analytics.
• Security and privacy — secure sign-in, encrypted data, and a clear privacy policy.

Launching in the App Store and Google Play

1. Developer accounts. Apple charges an annual fee for its developer program; Google Play charges a one-time registration fee. Open them in your business's name so you own the listings.
2. Store listing. App name, description, screenshots, icon, category and privacy details.
3. Review. Both stores review apps before they go live. Apple's review is generally stricter, so plan time for questions or small changes.
4. Payments. If you sell digital content or subscriptions inside the app, the stores' in-app purchase rules and commissions usually apply. Physical goods and real-world services can typically use your own payment provider. Check the current rules for your case.

After launch: apps need care

Apple and Google release new operating system versions every year, and phones keep changing. Budget for regular updates, bug fixes and security patches — plus the new features your users will ask for once they start using the app.

A sensible path

1. Validate the idea with conversations and a simple landing page.
2. Define a focused first version (MVP) around one core job.
3. Build it cross-platform on a solid back end.
4. Launch, measure what people actually use, then improve.

Want help with any of these steps? See our iPhone & Android app development page — or, if you have the idea but not the budget, pitch it as a 50/50 partnership.